2.9 μm emission properties and energy transfer mechanism in Dy3+/Tm3+-codoped tellurite glass

• We prepare Dy3+/Tm3+-codoped tellurite–zinc glasses.
• We report strong 2.9 μm emission with large emission cross-section.
• Detailed energy transfer processes between Dy and Tm are proposed.

Dy3+ and Dy3+/Tm3+-codoped tellurite–zinc glasses have been synthesized and studied by absorption and emission spectra. The Judd–Ofelt intensity parameters, energy transfer microparameters and efficiency have been determined and discussed. Intense 2.9 μm emission in Dy3+/Tm3+-codoped zinc–tellurite glasses was achieved under 800 nm laser diode excitation that confirms effective energy transfer from Tm3+ to Dy3+ ions. Possible energy transfer mechanism has been discussed based on the near- and mid-infrared emission spectra and the energy transfer microparameters. These results indicate that Dy3+/Tm3+-codoped tellurite–zinc glasses can be a potential medium for mid-infrared laser.

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